Cover Picture (Angew. Chem. Int. Ed. Engl. 4/1987)

The cover shows a space-filling model (drawn with the SCHAKAL program) of a tris(arene) gallium complex with a novel mode of coordination: gallium(I) is enclosed in the cavity formed by the three benzene rings of [2.2.2]paracyclophane. This is the first example of a metal complex containing three centrically bound neutral arene ligands. The central atom has no less than 19 atoms in its first coordination sphere—18 C atoms of the benzene rings and one Br atom of the anion GaBr4−, which forms a weak contact. Further details are reported by H. Schmidbaur et al. on page 338 ff.